{"product_id":"filter-king-11-5x21x1-air-filter-4-pack-merv-8-pleated","title":"Filter King 11.5x21x1 Air Filter 4-PACK - MERV 8 Pleated","description":"\u003cp\u003eIn this review the Filter King 11.5x21x1 Air Filter 4-pack is evaluated for everyday home HVAC use; it is best for homeowners and renters who want a step up from basic fiberglass filters without restricting airflow. The single biggest reason to consider these filters is their \u003cstrong\u003eMERV 8 pleated design\u003c\/strong\u003e, which captures more dust and allergens than flat panels while remaining easy to install. The pack of four and the stated 30 to 90 day replacement range make this a practical, lower-effort option for routine maintenance.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMERV 8 rating:\u003c\/strong\u003e Provides improved particle capture for household dust and common allergens without noticeably reducing airflow in most systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleated construction:\u003c\/strong\u003e The pleats increase surface area so the filter can trap more particles and run longer between changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Fully manufactured in the United States under EPA establishment number 103501-FL-1, indicating consistent materials and construction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-pack convenience:\u003c\/strong\u003e Shipping four filters together simplifies scheduled replacements and can reduce trips to a store.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy installation:\u003c\/strong\u003e The simple open, slide and close design makes swaps quick and tool-free for most homeowners.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product is ideal for homeowners, apartment dwellers, and light-commercial settings using standard 1 in filter slots who want better air quality than basic flat filters. The MERV 8 rating suits households concerned with dust, pet dander, and common allergens while keeping normal HVAC performance.\u003c\/p\u003e\u003cp\u003eThose who need ultra-fine particle removal, allergy-sensitive occupants requiring medical-grade filtration, or HVAC systems specified for thicker filters should look elsewhere for higher MERV ratings or deeper replacement sizes. Users who need a heavy-duty, extra-rigid frame may also prefer a different model.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGood balance of particle capture and airflow with a \u003cstrong\u003eMERV 8\u003c\/strong\u003e pleated media.\u003c\/li\u003e\n\u003cli\u003eMade in the USA and built from consistent materials under an EPA establishment number.\u003c\/li\u003e\n\u003cli\u003ePack of four offers value and convenience for scheduled maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSome customers report variability in perceived sturdiness, with occasional filters feeling less rigid than others.\u003c\/li\u003e\n\u003cli\u003eThe actual thickness is 0.75 in which may be a surprise if a full 1 in frame is expected.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFilter King\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e11.5 in x 21 in x 1 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual Size\u003c\/td\u003e\n\u003ctd\u003e11.5 in x 21 in x 0.75 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMERV Rating\u003c\/td\u003e\n\u003ctd\u003eMERV 8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Quantity\u003c\/td\u003e\n\u003ctd\u003e4 pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMade\u003c\/td\u003e\n\u003ctd\u003eMade in USA (EPA Establishment 103501-FL-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Replacement\u003c\/td\u003e\n\u003ctd\u003eEvery 30 to 90 days for 1 in filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Filter King 11.5x21x1 4-pack is a practical, good-value option for routine home HVAC maintenance, offering better particle capture than basic flat filters and simple installation. It is well suited for typical households that want improved air quality without sacrificing airflow, though buyers seeking extra-rigid frames or medical-grade filtration should consider alternative options.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow often should these filters be changed?\u003c\/strong\u003e\u003cbr\u003eChange every 30 to 90 days depending on household dust levels and pet presence; four filters cover several months of regular replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill a MERV 8 filter affect my HVAC airflow?\u003c\/strong\u003e\u003cbr\u003eMERV 8 pleated media is designed to capture more particles without significantly impacting airflow in most residential systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre these filters fully made in the United States?\u003c\/strong\u003e\u003cbr\u003eYes, they are fully manufactured in the USA and listed under EPA establishment number 103501-FL-1.\u003c\/p\u003e","brand":"Filter King","offers":[{"title":"Default Title","offer_id":48239993258203,"sku":"B07GT88F3S","price":53.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71qFQkc28jL._AC_SL1500.jpg?v=1771097434","url":"https:\/\/gearmusthave.com\/products\/filter-king-11-5x21x1-air-filter-4-pack-merv-8-pleated","provider":"GearMustHave","version":"1.0","type":"link"}